#include <wchar.h>

wchar_t *wcstok(wchar_t *restrict s, const wchar_t *restrict sep, wchar_t **restrict p)
{
    if (!s && !(s = *p)) return NULL;
    s += wcsspn(s, sep);
    if (!*s) return *p = 0;
    *p = s + wcscspn(s, sep);
    if (**p) *(*p)++ = 0;
    else *p = 0;
    return s;
}
